Direct numerical simulation of internal wave attractors
Wednesday 16 December 2009
to 14:30 at
Boris Dintrans (Observatoire Midi-Pyrénées, Toulouse)
I will present the first simulations of internal wave attractors done with the Pencil Code. Internal waves are gravity waves that propagate only in stably-stratified regions like the radiative zones of stars. When the pulsating star rotates rapidly (rotation period of the same order than the oscillation one), a fascinating feature appears as the wave energy can be focused along attractors. As a consequence, the resulting oscillation spectrum is a mixture of normal eigenmodes and singular ones depending on the associated orbit of characteristics (i.e. ergodic or focused). I will review both experiments and numerical simulations of this phenomenon that appears in non-separable geometries.